目录容摘要···················································································（2）第一章 电梯概述········································································（3）1.1电梯的组成······································································（3）1.2电梯的工作原理································································（4）第二章 电梯控制系统的控制分析··················································（5）2.1 电梯继电器控制系统的特点与存在问题································（5）2.2 PLC与在电梯控制中的应用特点··········································（5）第三章 可编程控制器的机型选择··················································（7）3.1 PLC的I／O点数估算························································（7）3.2响应时间·········································································（7）3.3 输入输出模块的选择·························································（7）3.4 机型的确定·····································································（7）第四章 硬件设计·······································································（9）4.1四层电梯主电路设计·····························...
